JPS6056057A - Production of wear resistant aluminum alloy material having excellent machinability - Google Patents

Abstract

PURPOSE:To develop an Al alloy of which the machinability is improved and the variance in the wear resistance is decreased by adding elements for refining primary crystal Si grains to the specifically composed wear resistant Al alloy and subjecting the casting ingot thereof to hot extrusion. CONSTITUTION:One or both of 0.01-0.1% Sn and 0.01-0.1% P are added and incorporated as elements for refining primary crystal Si grains in the stage of casting to a wear resistant Al alloy contg. 10-30% Si, 0.3-5% Cu and 0.3- 2% Mo. The ingot of such Al alloy is hot extruded to refine the coarse grains of the primary crystal Si in the range of 10-80mum grain size and to refine the autectic Si to <=15mum grain size as well. Since the primary crystal Si and eutectic Si grains are refined and are uniformly dispersed, the machinability is improved, the life of a cutting tool is extended and the variance in the wear resistance is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, for example, engine cylinder liners, V
The present invention relates to a method for manufacturing wear-resistant aluminum alloy materials used in various mechanical parts that require wear resistance, such as TR cylinders, engine pistons, and combrella vanes.

In addition, in this specification, all "%" means "% by weight"
This shows that.

Conventionally, as this type of wear-resistant aluminum alloy material, Aρ-3i series containing about 10 to 20% of Sl, such as AC3A and AC8A-C, have been used.

Aluminum alloy castings such as AC9A-B are well known. However, since these aluminum alloy materials are cast, they have a uniform 3i value in terms of wear resistance.
The primary crystal grains of the material were considerably large with a particle size of 10 to 150 μm (and their dispersion was non-uniform), resulting in a drawback of large variations in the wear resistance of the material.

Moreover, this type of wear-resistant alloy is manufactured into the desired product by cutting the casting, but the eutectic Si particles that are crystallized during casting are also relatively large and Generally, machinability is poor due to the needle-like shape;
In particular, there was a drawback that the life of the cutting tool was short.

Therefore, the present invention was made with the aim of reducing the above-mentioned variations in wear resistance of wear-resistant aluminum alloys and improving machinability at the same time. Further, by hot extrusion, both the primary Si particles and the eutectic 3i particles are refined to a predetermined particle size range,
At the same time, by making it uniformly dispersed,
It was completed based on the discovery and knowledge that greatly improved the variation in cutting tool life and wear resistance.

That is, in this invention, 5i10-30%, Quo, 3-5
%, Mao, 3-2%, and SrO,01-0
．． By melting and casting an aluminum-based alloy containing one or more of 1%, Po, and 01 to 0.1% to create an ingot, and then hot extruding this ingot,
The coarse primary 3i particles contained in the ingot are destroyed to reduce the particle size to 10
This relates to a method for producing a wear-resistant aluminum alloy material with excellent machinability, characterized in that the grain size is refined to a range of ~80 μm, and the eutectic Si particles are also refined to a grain size of 15 μm or less. be.

First, the significance of adding the above-mentioned alloy components and the reason for limiting the composition range will be explained as follows.

As is well known, 3i is effective as a wear resistance improving component, and if it is less than 10%, the wear resistance will be poor, but if it is contained in excess of 30%,
Casting becomes difficult.

Both C0 and Mg contribute to improving the strength of the alloy, and if the content is less than 0.3%, the effect is insufficient. However, when CI+ exceeds 5%, corrosion resistance deteriorates significantly. Moreover, when M( ) exceeds 2%, the above-mentioned effects are not particularly enhanced, but rather coarse crystallized substances are produced and the mechanical quality is deteriorated.

Both 3r and P act as refining agents to refine primary Si particles during casting, and it is sufficient to contain at least one of them, but if each is less than 0.01%, the above effect is poor, and 0. Even if it exceeds .1%, no particular increase in effect can be expected.

Furthermore, in addition to the above-mentioned essential components, the aluminum alloy used in the present invention may preferably further contain one or more of N1, Fe, and Mn in the range of 0.5 to 3.0% each. Ru. Both of these ingredients are
It contributes to improving heat resistance, but each component is 0.5
If it is less than 3%, the effect will be poor, and if it exceeds 3%, the machinability will be extremely poor.

Next, the manufacturing process will be explained. The above aluminum alloy is first manufactured into an aluminum alloy casting by melting and casting according to a conventional conventional method. The primary St powder particles contained in the ingot obtained by this casting are refined by the addition of Sr and/or P, but
Nevertheless, the particle size is still quite large, generally in the range of 20-100 microns. Further, the eutectic Si particles are also large, with a particle size of 30 μm or less, and have an acicular shape.

Therefore, in the present invention, the ingot containing these primary crystal and eutectic 3i particles is further extruded at a temperature of about 420 to 430°C. Moreover, this hot extrusion destroys a part of the coarse primary Si particles with a particle size of 10 to 1.0 μm contained in the alloy, and the particle size is in the range of 10 to 80 μm and 40 μm.
At the same time, the eutectic Si particles are refined to a range in which particles of μTrt or larger occupy an area ratio of 60% or less, and their distribution is made uniform, and the eutectic Si particles are also reduced to a particle size of 15 μm or less, with particles of 10 μm or less occupying a 60% area ratio. % or less.

According to the method according to the present invention as described above, the primary crystal Si particles and the primary crystal Si in the obtained aluminum alloy material
By making the particles finer within the above-mentioned particle size range and making their distribution more uniform, it is possible not only to maintain the desired wear resistance and reduce its dispersion, but also to achieve excellent tool machinability and In particular, it has a sharp ring effect that greatly increases the life of the cutting tool. Therefore, a wear-resistant aluminum alloy material with superior performance than conventional products can be produced through a simple manufacturing process and at a relatively low cost! It has the advantage of being able to be created and provided.

Examples of this invention will be shown below.

Table 1 Regarding aluminum-based alloys having the composition shown in Table 1 above,
They were first melted and semi-continuously cast to produce billets with a diameter of 120a+s+. However, the particle size of the primary crystal S1 particles contained in the billet was 10 to 100 μm, and the particle size of the 1 eutectic 81 particles was 30 μm or less and had an acicular shape.

Next, this billet was processed into a material with a diameter of 30#l# under the conditions of an extrusion temperature of 425℃ and an extrusion ram speed of 0.04m/1n.
The desired aluminum alloy material was obtained by extruding it into a round bar.

The wear resistance and machinability of the various aluminum alloy materials thus obtained were compared with as-cast samples, and the results were as shown in Tables 2 and 3 below.

[Margin below]

Table 2 Wear resistance (Note 1) (Note 1): The wear resistance test was conducted using an Ohkoshi type wear resistance tester with a rotating disk.Friction distance: 1lIll: 600TrL 1Friction speed: 2m/mi
n, counterpart material: The test was conducted under the test conditions of FC-30 (Jls).

As can be seen from the binding in the above table, the aluminum alloy material manufactured by this invention has the effect of clearly reducing the specific wear amount and reducing its dispersion compared to the as-cast material. Met.

Table 3 Cutting tool life (Note 2) (Note 2): Cutting tool life is based on front rake angle of 20 degrees, side rake angle: 10 degrees, front retraction angle in degrees, side relief angle = 7 degrees, front Use a carbide cutting tool with the following specifications: cutting edge angle: 8 degrees, side edge angle: 0 degrees, nose radius: 0 degrees, cutting depth: 0.1 m * 1 feed rate 0.05 ## I, rotation speed: 500
After cutting with a cutting distance of 200 m under the cutting conditions of rpm and lubricant: petroleum, the wear width of the flank surface of the cutting tool was measured.

From the results in Table 3 above, it can be seen that the aluminum alloy material according to the present invention has extremely small wear on the flank face of the cutting tool C compared to the cast product, and can significantly improve the life of the cutting tool. .

1980 3□21.3 Amendment to the procedure Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Relationship to the oil-based indication Patent Application No. 16579 case filed in 1980 Patent applicant Furigana: 6-224, Kaiyama-cho, Sakai City Tokoro Name (Name) Showa Aluminum Co., Ltd. 4, Agent Representative Hisashi Kawachi 6, Number of inventions increased due to amendment 8, Details of the amendment (amended) 1. Name of the invention Excellent machinability Manufacturing method 2 of wear-resistant aluminum alloy material, claim 5i 10-30%, Cu 0.3-5%, MgO, 3-2
% is melted and cast to create an ingot, and then this ingot is hot extruded to destroy the coarse primary Si particles contained in the ingot and reduce the particle size to 10. ~
A method for producing a wear-resistant aluminum alloy material with excellent machinability, characterized in that the grain size of the eutectic Si particles is refined to a range of 80 μm, and the grain size of the eutectic Si particles is also refined to 15 μm or less.

3. Detailed Description of the Invention The present invention is applicable to engine cylinder liners, V
The present invention relates to a method for manufacturing wear-resistant aluminum alloy materials used in various mechanical parts such as TR cylinders, engine pistons, and compressor vanes that require wear resistance.

In this specification, all "%" regarding alloy components indicate "% by weight".

Conventionally, this type of wear-resistant aluminum alloy material includes AQ'-8i series, such as AC3A and AC8A-C, containing about 10 to 20% Si.

Aluminum alloy castings such as AC9A-B are well known. However, since these aluminum alloy materials are cast, they have 3i, which contributes to improved wear resistance.
The primary crystal grains of this material are generally coarse, including large ones with a particle size of 150 μm, and their dispersion is uneven, so there is a drawback that the wear resistance of the material varies widely. Ta. Moreover, when this type of wear-resistant alloy is manufactured into a desired product by cutting the casting, the eutectic 3i particles that are crystallized during casting are also relatively large and have an acicular shape. Therefore, the machinability is generally poor, and the cutting tool life is particularly short.

Therefore, the present invention was made with the aim of reducing the above-mentioned variations in wear resistance of wear-resistant aluminum alloys and improving machinability at the same time. Further, by hot extrusion, both the primary Si particles and the eutectic 3i particles are refined to a predetermined particle size,
At the same time, by making it uniformly dispersed,
It was completed based on the discovery and knowledge that greatly improved the variation in cutting tool life and wear resistance.

That is, in this invention, 5i10-30%, Quo, 3-5
%, M (+0.3 to 2%) is melted and cast to create an ingot, and then this ingot is extruded under hot conditions to remove coarse primary crystals contained in the ingot. A wear-resistant aluminum with excellent machinability, characterized in that the 3i particles are destroyed and refined to a grain size in the range of 10 to 80 μm, and the eutectic Si particles are also refined to a grain size of 15 μm or less. The present invention relates to a method for producing an alloy material.

First, the significance of adding the above-mentioned alloy components and the reason for limiting the composition range will be explained as follows.

As is well known, 3i is effective as a wear resistance improving component, and if it is less than 10%, the wear resistance will be poor, but if it is contained in excess of 30%,
Casting becomes difficult.

Cu and M(+) both contribute to improving the bullet hole of the alloy, and if it is less than 0.3%, the effect is ineffective. However, when the CLI exceeds 5%, the corrosion resistance is significantly reduced. Moreover, when MO exceeds 2%, the above effects are not particularly enhanced, but rather coarse crystallized substances are produced and the mechanical quality is deteriorated.

The aluminum alloy used in this invention may contain various other significant additives in addition to the above-mentioned components. For example, as a preferable optional additive element, S"
and/or P may be used. All of these elements are equivalent in that they act as refining agents to refine primary 3i particles during casting, and it is sufficient to contain at least one of them, but less than 0.005% of each The above-mentioned effects are poor, and even if it exceeds 0.1%, no particular increase in effect can be expected.

Furthermore, Ni can be used as another optional additive element.
, Fe, and yln.

All of these elements effectively contribute to improving the heat resistance of the alloy, and in terms of this effect, they are all equivalent, and it is sufficient to contain at least one or two or more of them. If the content is less than 0.5%, it is difficult to achieve the above effects, and if the content exceeds 3%, the machinability is extremely poor (defects arise).

Next, the manufacturing process will be explained. The above aluminum alloy is first manufactured into an aluminum alloy casting by melting and casting according to a conventional conventional method. The primary 3i particles contained in the ingot obtained by this casting are refined by the addition of SP and/or P, but
Nevertheless, the particle size is still quite large, generally in the range 20-100 μm. Moreover, the eutectic 3i particles are also quite large, with a particle size of 30 μm or less, and have an acicular shape.

Therefore, in the present invention, the ingot containing these primary crystals and eutectic 3i particles is further extruded at a temperature of about 420 to 430°C. Moreover, this hot extrusion destroys a part of the coarse primary 3i particles with a particle size of 10 to 1100 μm contained in the alloy, and the particle size is in the range of 10 to 80 μm and 40 μm.
The eutectic 3
The i-particles also have a particle size of 15 μm or less and a particle size of 10 μm or less.
It is assumed that the particles are refined to a range in which particles of μm or less occupy an area ratio of 60% or less.

According to the method according to the present invention as described above, the primary crystal S1 particles and primary crystal S1 in the obtained aluminum alloy material
By making the particles finer within the above-mentioned particle size range and making their distribution more uniform, it is possible not only to maintain the desired wear resistance and reduce its dispersion, but also to achieve excellent tool machinability and In particular, it is possible to achieve the effect of significantly increasing the life of cutting tools. Therefore, it is possible to manufacture and provide a wear-resistant aluminum alloy material having performance superior to conventional products through a simple manufacturing process and at a relatively low cost.

Examples of the present invention will be shown below.

Table 1 Regarding aluminum-based alloys having the composition shown in Table 1 above,
They were first melted and semi-continuously cast, and the diameter was 120JIII1.
A billet of No. 1 was produced. However, the particle size of the primary 3i particles contained in the billet was 10 to 100 μm, and the particle size of the eutectic Si particles was 30 μ'rrL or less and had a needle shape.

Next, this billet was extruded at a diameter of 30m+* under the conditions of an extrusion temperature of 425°C and an extrusion ram speed of 0.04m/1n.
The desired aluminum alloy material was obtained by extruding it into a round bar.

The wear resistance and machinability of the various aluminum alloy materials thus obtained were compared with as-cast samples, and the results were as shown in Tables 2 and 3 below.

[Margin below]

Table 2 Wear resistance (Note 1) (Note 1): The wear resistance test was conducted using an Okoshi type wear resistance tester with a rotating disk, friction distance: 600 m, friction speed: 2 H/sin, Comparison material: FC-30 (JIS) test conditions were used.

As can be seen from the results in the above table, the aluminum alloy material manufactured by the present invention has the effect of clearly reducing the specific wear amount and reducing its dispersion compared to the as-cast material. Met.

Table 3 Cutting tool life (Note 2) (Note 2): Cutting tool life is based on front rake angle 20 marks, test rake angle = 10 degrees, front relief angle nearness, side relief angle nearness *, front cutting edge angle Use a carbide cutting tool with the following specifications: 8 degrees, side edge angle: 0 degrees, nose radius: 0 degrees, depth of cut 0.1jw+, feed rate 0.05m.

After cutting a cutting path of 111t: 200 m under the cutting conditions of In (rotation speed: 500 rl) and trim agent: petroleum, the wear width of the flank surface of the cutting tool was measured.

From the results in Table 3 above, it can be seen that the aluminum alloy material according to the present invention has extremely little wear on the tightened surface of the cutting tool compared to cast products, and can significantly improve the life of the cutting tool. .

that's all

Claims (1)

[Claims] 5i10~30%, Cu0.3~5%, M(10,3~
2% and 5rO101~0°1%, Po, 01
The coarse particles contained in the ingot are melted and cast by melting and casting an aluminum-based alloy containing one or more of ~o and i%, and then extruding this ingot under hot conditions. The primary crystal 3i grains are destroyed and refined to a grain size in the range of 10 to 80 μm, and the eutectic S1 grains are also refined to a grain size of 15 μm or less. Method of manufacturing abradable aluminum alloy material.